Emissions of dioxins and furans during steam gasification of Automotive Shredder residue; experiences from the Chalmers 2–4-MW indirect gasifier
Artikel i vetenskaplig tidskrift, 2020

Emissions of dioxins and furans during the gasification of Automotive Shredder Residue (ASR) were investigated. The experimental work was carried out in a Dual Fluidized Bed (DFB) system, which consists of a 2–4-MWth gasifier that is fluidized with steam, and an interconnected fluidized bed combustor that is fluidized with air. Two different ASR fractions with higher and lower contents of plastic were tested. Measurements were carried out in the flue gas stream exiting the combustion side of the DFB, as well as in the raw gas stream exiting the gasifier side. A calcium (lime) coat was applied to the flue gas filter to ensure compliance with the emissions regulations regarding the retention of HCl and dioxins. The results showed lower emissions of polychlorinated dibenzo-p-dioxins/dibenzofurans (PCDD/PCDF) in the flue gas when the raw gas derived from the ASR gasification was combusted, as compared to the direct combustion of ASR. The level of polychlorinated compounds in the flue gas before the lime-coated filter was 0.11 ng/m3N dry gas (I-TEQ) when gasification was used as a pre-step, as compared to 0.27 ng/m3N dry gas (I-TEQ) when the ASR was directly combusted. The raw gas produced by gasification contained very low levels of PCDD/PCDF, whereby the toxicity per kg of ASR was 0.17 ng/kgASR, as compared to 3.44 ng/kgASR after passage through the combustion and cooling sections and 0.34 ng/kgASR at the outlet after the lime-coated filter. A higher content of plastic in the ASR led to an increase in the levels of dioxins and furans in the raw gas, with the highest yield seen for highly chlorinated compounds, while higher temperature in the gasifier is shown to be beneficial in reducing dioxin formation.

Dual Fluidized Bed (DFB)

Dioxin

PCDD/PCDF Emissions

ASR

Steam gasification

Författare

Jelena Maric

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik, Energiteknik 2

Teresa Berdugo Vilches

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Sébastien Pissot

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik, Energiteknik 2

Isabel Cañete Vela

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik, Energiteknik 2

Martin Seemann

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Waste Management

0956-053X (ISSN)

Vol. 102 1 February 2020 114-121 0956-053X

Materialåtervinning av plastfraktioner via termisk omvandling

Energimyndigheten, 2017-12-15 -- 2019-12-31.

Ämneskategorier

Oorganisk kemi

Kemiska processer

Kemiteknik

Polymerteknologi

Miljöledning

Textil-, gummi- och polymermaterial

Drivkrafter

Hållbar utveckling

Innovation och entreprenörskap

Styrkeområden

Energi

Materialvetenskap

Infrastruktur

Chalmers kraftcentral

DOI

10.1016/j.wasman.2019.10.037

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Senast uppdaterat

2021-04-15